forked from Imagelibrary/rtems
@@ -1,207 +0,0 @@
|
||||
/* clock.c
|
||||
*
|
||||
* This routine initializes the PIT on the MPC8xx.
|
||||
* The tick frequency is specified by the bsp.
|
||||
*/
|
||||
|
||||
/*
|
||||
* Author: Jay Monkman (jmonkman@frasca.com)
|
||||
* Copyright (C) 1998 by Frasca International, Inc.
|
||||
*
|
||||
* Derived from c/src/lib/libcpu/ppc/ppc403/clock/clock.c:
|
||||
*
|
||||
* Author: Andrew Bray <andy@i-cubed.co.uk>
|
||||
*
|
||||
* COPYRIGHT (c) 1995 by i-cubed ltd.
|
||||
*
|
||||
* To anyone who acknowledges that this file is provided "AS IS"
|
||||
* without any express or implied warranty:
|
||||
* permission to use, copy, modify, and distribute this file
|
||||
* for any purpose is hereby granted without fee, provided that
|
||||
* the above copyright notice and this notice appears in all
|
||||
* copies, and that the name of i-cubed limited not be used in
|
||||
* advertising or publicity pertaining to distribution of the
|
||||
* software without specific, written prior permission.
|
||||
* i-cubed limited makes no representations about the suitability
|
||||
* of this software for any purpose.
|
||||
*
|
||||
* Derived from c/src/lib/libcpu/hppa1_1/clock/clock.c:
|
||||
*
|
||||
* COPYRIGHT (c) 1989-2007.
|
||||
* On-Line Applications Research Corporation (OAR).
|
||||
*
|
||||
* The license and distribution terms for this file may be
|
||||
* found in the file LICENSE in this distribution or at
|
||||
* http://www.rtems.org/license/LICENSE.
|
||||
*/
|
||||
|
||||
#include <rtems.h>
|
||||
#include <rtems/clockdrv.h>
|
||||
#include <rtems/libio.h>
|
||||
#include <rtems/powerpc/powerpc.h>
|
||||
|
||||
#include <stdlib.h> /* for atexit() */
|
||||
#include <mpc8xx.h>
|
||||
#include <bsp.h>
|
||||
|
||||
volatile uint32_t Clock_driver_ticks;
|
||||
extern volatile m8xx_t m8xx;
|
||||
extern int BSP_get_clock_irq_level(void);
|
||||
extern uint32_t bsp_clicks_per_usec;
|
||||
|
||||
/*
|
||||
* Prototypes
|
||||
*/
|
||||
rtems_isr Clock_isr(rtems_vector_number vector);
|
||||
void Clock_exit( void );
|
||||
void clockOn(void* unused);
|
||||
void clockOff(void* unused);
|
||||
int clockIsOn(void* unused);
|
||||
void Install_clock(rtems_isr_entry clock_isr);
|
||||
void ReInstall_clock(rtems_isr_entry new_clock_isr);
|
||||
|
||||
/*
|
||||
* ISR Handler
|
||||
*/
|
||||
rtems_isr Clock_isr(rtems_vector_number vector)
|
||||
{
|
||||
m8xx.piscr |= M8xx_PISCR_PS;
|
||||
Clock_driver_ticks++;
|
||||
rtems_clock_tick();
|
||||
}
|
||||
|
||||
void clockOn(void* unused)
|
||||
{
|
||||
unsigned desiredLevel;
|
||||
uint32_t pit_value;
|
||||
uint32_t extclk;
|
||||
bool force_prescaler = false;
|
||||
uint32_t immr_val;
|
||||
|
||||
if (bsp_clicks_per_usec == 0) {
|
||||
/*
|
||||
* oscclk is too low for PIT, compute extclk and derive PIT from there
|
||||
*/
|
||||
/*
|
||||
* determine external input clock by examining the PLL settings
|
||||
* this must be done differently depending on type of PLL
|
||||
*/
|
||||
_mfspr(immr_val,M8xx_IMMR);
|
||||
if (8 == ((immr_val & 0x0000FF00) >> 8)) {
|
||||
/*
|
||||
* for MPC866: complex PLL
|
||||
*/
|
||||
uint32_t plprcr_val;
|
||||
uint32_t mfn_value;
|
||||
uint32_t mfd_value;
|
||||
uint32_t mfi_value;
|
||||
uint32_t pdf_value;
|
||||
uint32_t s_value;
|
||||
|
||||
plprcr_val = m8xx.plprcr;
|
||||
mfn_value = (plprcr_val & (0xf8000000)) >> (31- 4);
|
||||
mfd_value = (plprcr_val & (0x07c00000)) >> (31- 9);
|
||||
s_value = (plprcr_val & (0x00300000)) >> (31-11);
|
||||
mfi_value = (plprcr_val & (0x000f0000)) >> (31-15);
|
||||
pdf_value = (plprcr_val & (0x00000006)) >> (31-30);
|
||||
extclk = (((uint64_t)bsp_clock_speed)
|
||||
* ((pdf_value + 1) * (mfd_value + 1))
|
||||
/ (mfi_value * (mfd_value + 1) + mfn_value)
|
||||
* (1 << s_value));
|
||||
}
|
||||
else {
|
||||
/*
|
||||
* for MPC860/850 etc: simple PLL
|
||||
*/
|
||||
uint32_t mf_value;
|
||||
mf_value = m8xx.plprcr >> 20;
|
||||
extclk = bsp_clock_speed / (mf_value+1);
|
||||
}
|
||||
pit_value = (extclk
|
||||
/ 1000
|
||||
/ 4
|
||||
* rtems_configuration_get_microseconds_per_tick()
|
||||
/ 1000);
|
||||
m8xx.sccr |= (1<<23);
|
||||
force_prescaler = true;
|
||||
}
|
||||
else {
|
||||
pit_value = (rtems_configuration_get_microseconds_per_tick() *
|
||||
bsp_clicks_per_usec);
|
||||
|
||||
m8xx.sccr &= ~(1<<23);
|
||||
}
|
||||
|
||||
if ((pit_value > 0xffff) || force_prescaler) {
|
||||
/*
|
||||
* try to activate prescaler
|
||||
* NOTE: divider generates odd values now...
|
||||
*/
|
||||
pit_value = pit_value / 128;
|
||||
m8xx.sccr |= (1<<24);
|
||||
}
|
||||
else {
|
||||
m8xx.sccr &= ~(1<<24);
|
||||
}
|
||||
|
||||
if (pit_value > 0xffff) { /* pit is only 16 bits long */
|
||||
rtems_fatal_error_occurred(-1);
|
||||
}
|
||||
m8xx.pitc = pit_value - 1;
|
||||
|
||||
desiredLevel = BSP_get_clock_irq_level();
|
||||
/* set PIT irq level, enable PIT, PIT interrupts */
|
||||
/* and clear int. status */
|
||||
m8xx.piscr = M8xx_PISCR_PIRQ(desiredLevel) |
|
||||
M8xx_PISCR_PTE | M8xx_PISCR_PS | M8xx_PISCR_PIE;
|
||||
}
|
||||
|
||||
/*
|
||||
* Called via atexit()
|
||||
* Remove the clock interrupt handler by setting handler to NULL
|
||||
*/
|
||||
void clockOff(void* unused)
|
||||
{
|
||||
/* disable PIT and PIT interrupts */
|
||||
m8xx.piscr &= ~(M8xx_PISCR_PTE | M8xx_PISCR_PIE);
|
||||
}
|
||||
|
||||
int clockIsOn(void* unused)
|
||||
{
|
||||
if (m8xx.piscr & M8xx_PISCR_PIE)
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Called via atexit()
|
||||
* Remove the clock interrupt handler by setting handler to NULL
|
||||
*/
|
||||
void Clock_exit(void)
|
||||
{
|
||||
(void) BSP_disconnect_clock_handler ();
|
||||
}
|
||||
|
||||
void Install_clock(rtems_isr_entry clock_isr)
|
||||
{
|
||||
Clock_driver_ticks = 0;
|
||||
|
||||
BSP_connect_clock_handler (clock_isr);
|
||||
atexit(Clock_exit);
|
||||
}
|
||||
|
||||
void ReInstall_clock(rtems_isr_entry new_clock_isr)
|
||||
{
|
||||
BSP_connect_clock_handler (new_clock_isr);
|
||||
}
|
||||
|
||||
rtems_device_driver Clock_initialize(
|
||||
rtems_device_major_number major,
|
||||
rtems_device_minor_number minor,
|
||||
void *pargp
|
||||
)
|
||||
{
|
||||
Install_clock( Clock_isr );
|
||||
|
||||
return RTEMS_SUCCESSFUL;
|
||||
}
|
||||
File diff suppressed because it is too large
Load Diff
@@ -56,7 +56,6 @@ endif
|
||||
|
||||
librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/shared/cache/cache.c
|
||||
librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/shared/btimer/btimer-ppc-dec.c
|
||||
librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/dev/console-generic.c
|
||||
librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/start/cp.c
|
||||
librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/start/dpram.c
|
||||
librtemsbsp_a_SOURCES += ../../../../../../bsps/powerpc/tqm8xx/start/mmu.c
|
||||
|
||||
Reference in New Issue
Block a user